#include＜intrins.h＞ contains the function description-EEWORLD

_crawl_ Characters rotate left	Shift the char type variable to the left by the specified number of bits and return it (fill the high bit with the low bit)
_cror_ Characters rotate right	Shift the char type variable rightward by the specified number of bits and return it (fill the low bits with the high bits)
_irol_ Rotate left integer	Shift the int variable to the left by the specified number of bits and return it (fill the high bits with the low bits)
_iror_ Rotate right integer	Shift the int variable rightwards by the specified number of bits and return it (fill the low bits with the high bits)
_lrol_ Circular left shift of long integer	Shift the long type variable to the left by the specified number of bits and return it (fill the high bits with the low bits)
_lror_ Long integer circular right shift	Shift the long variable rightwards by the specified number of bits and return it (fill the low bits with the high bits)
_nop_	No operation 8051 NOP instruction
_test piece_	Test and clear bit 8051 JBC instruction

Function name	_crol_，_irol_，_lrol_
Prototype	unsigned char _crol_(unsigned char val,unsigned char n); unsigned int _irol_(unsigned int val,unsigned char n); unsigned int _lrol_(unsigned int val,unsigned char n);
Function	_crol_, _irol_, _lrol_ shift val left by n bits in bitwise form. This function is related to the 8051 "RLA" instruction. The above functions differ in the parameter type.

Function name	_cror_，_iror_，_lror_
Prototype	unsigned char _cror_(unsigned char val,unsigned char n); unsigned int _iror_(unsigned int val,unsigned char n); unsigned int _lror_(unsigned int val,unsigned char n);
Function	_cror_, _iror_, _lror_ shift val right by n bits in bitwise form. This function is related to the 8051 "RRA" instruction. The above functions differ in parameter type. _testbit_: Equivalent to JBC bitvar to test the bit variable and jump and clear at the same time. _chkfloat_: Test and return the source point state.

Function name	_nop_
Prototype	void _nop_(void);
Function	_nop_ generates a NOP instruction, which can be used for time comparison in C programs. The C51 compiler does not generate a function call during the operation of the _nop_ function, that is, the NOP instruction is directly executed in the program.

Function name	_test piece_
Prototype	bit _testbit_(bit x);
Function	_testbit_ generates a JBC instruction that tests a bit and returns 1 if it is set, otherwise 0. If the bit is set, it resets the bit to 0. The 8051 JBC instruction is used for this purpose. _testbit_ can only be used on directly addressable bits; it is not allowed in expressions.

Reference address：#include＜intrins.h＞ contains the function description

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